Cannot read an image in jar file

There is missing some information in the question how the jar file is actually built, but with the following directory layout

├── bin │   ├── com │   │   └── example │   │   └── ImageIconTest.class │   └── icons │   └── exit.png └── src ├── MANIFEST.MF └── com └── example └── ImageIconTest.java 

and the following code in ImageIconTest.java

package com.example; import javax.swing.ImageIcon; public class ImageIconTest { public void run() { ImageIcon ii = new ImageIcon(getClass().getClassLoader().getResource("icons/exit.png")); System.out.println(ii); } public static void main(String[] args) { ImageIconTest app = new ImageIconTest(); app.run(); } } 

you can properly run the sample from the file system with

$ java -classpath bin com.example.ImageIconTest 

Using a MANIFEST.MF file with the following content:

Manifest-Version: 1.0 Main-Class: com.example.ImageIconTest 

you can package it into an executable jar file and run it from the jar file:

$ jar cvfm app.jar src/MANIFEST.MF -C bin . $ java -jar app.jar 

Both approaches are working fine, the important detail is to make sure that the icon directory is included in the jar file at the proper location.

When listing the jar file contents, it should look like this:

 0 Tue Nov 06 12:27:56 CET 2012 META-INF/ 107 Tue Nov 06 12:27:56 CET 2012 META-INF/MANIFEST.MF 0 Tue Nov 06 12:27:56 CET 2012 com/ 0 Tue Nov 06 12:27:56 CET 2012 com/example/ 950 Tue Nov 06 12:27:56 CET 2012 com/example/ImageIconTest.class 0 Tue Nov 06 12:00:36 CET 2012 icons/ 873 Tue Nov 06 12:00:36 CET 2012 icons/exit.png 

Note the location of the icons directory.

The Exception is occurring when MediaPlayer in package mediaplayer calls for an embedded resource at "icons/exit.png". This would resolve to a path of:

mediaplayer/icons/exit.png 

I am guessing that is not the path, which is actually.

icons/exit.png 

That is why the String needs to be "/icons/exit.png" - note the / prefix.

The / that precedes the String informs the class-loader that we mean it to search for the resource from the root of the class path, as opposed to the package of the class from which it is called.

Thanx a lot everyone. I figured out the answer

button = new JButton(new ImageIcon(getClass().getResource("/icons/playlist.png"))); 

i removed the ClassLoader() and it worked,but i just dont know why. Can somebody please explain me the theory behind this.?

This code works well:

ClassLoader cl = getClass().getClassLoader(); InputStream stream = cl.getResourceAsStream( "hpms/study/Starbucks.jpg" ); if( stream == null ) System.err.println( "resource not found" ); BufferedImage image = ImageIO.read( stream ); ImageIcon icon = new ImageIcon( image );